×Heucherella plant named ‘TNHERHHL’

ABSTRACT

A new and distinct × Heucherella  plant substantially as shown and described, characterized by solid lime green colored leaves for most of the year, distinctively lobed, palmately divided leaves, small white flowers on short flower stalks, a medium plant size with multiple crowns, and excellent vigor.

Botanical denomination: ×Heucherella hybrid.

Variety designation: ‘TNHERHHL’.

Cross reference to ×Heucherella ‘Buttered Rum’ (U.S. Plant Pat. No. 25,040) and ×Heucherella ‘Mojito’ (U.S. Plant Pat. No. 26,946).

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinct cultivar of ×Heucherella and given the cultivar name of ‘TNHERHHL’. ×Heucherella is in the family Saxifragaceae. ×Heucherella ‘TNHERHHL’ originated from a whole plant mutation of ×Heucherella ‘Buttered Rum’ (U.S. Plant Pat. No. 25,040), found in the greenhouse in Canby, Oreg.

Compared to ×Heucherella ‘Buttered Rum’ (U.S. Plant Pat. No. 25,040), this new cultivar has solid lime leaves rather than orange amber to red brown leaves with a red pattern on the veins.

Compared to ×Heucherella ‘Mojito’ (U.S. Plant Pat. No. 26,946), the new cultivar is solid lime green rather than yellow to yellow green with a red center.

SUMMARY OF THE INVENTION

The following traits have been repeatedly observed and are determined to be the unique characteristics of ‘TNHERHHL’. This new ×Heucherella is unique in having the following characteristics:

-   -   1. solid lime green colored leaves for most of the year,     -   2. distinctively lobed, palmately divided leaves,     -   3. small white flowers on short flower stalks     -   4. medium plant size with multiple crowns, and     -   5. excellent vigor.

This new cultivar has been reproduced only by asexual propagation (division and tissue culture). Each of the progeny exhibits identical characteristics to the original plant. Asexual propagation by division and tissue culture using standard micropropagation techniques with terminal and lateral shoots, as done in Canby, Oreg., shows that the foregoing characteristics and distinctions come true to form and are established and transmitted through succeeding propagations. The present invention has not been evaluated under all possible environmental conditions. The phenotype may vary with variations in environment without a change in the genotype of the plant.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a four-month-old ×Heucherella ‘TNHERHHL’ growing in a 4″ pot in a cool greenhouse in February in Canby, Oreg.

FIG. 2 shows a nine-month-old in flower growing in a one gallon container in the greenhouse in early spring in Canby, Oreg.

FIG. 3 shows a one-year-old ×Heucherella ‘TNHERHHL’ in a one gallon container in the greenhouse trial bed in February in Canby, Oreg.

DETAILED PLANT DESCRIPTION

The following is a detailed description of the new ×Heucherella cultivar based on observations of one-year-old specimens growing in one gallon containers in a cool greenhouse in Canby, Oreg. Canby is Zone 8 on the USDA Hardiness map. Temperatures range from a high of 95° F. in August to an average of 32° F. in January. Normal rainfall in Canby is 42.8 inches per year. The color descriptions are all based on The Royal Horticultural Society Colour Chart, fifth edition, 2007.

-   Plant:     -   -   Form.—Basal rosette, herbaceous perennial.         -   Hardiness.—USDA Zone 4 to 9.         -   Size.—20 cm tall from top of the foliage to the ground and             42 cm wide.         -   Habit.—Mounding.         -   Vigor.—Excellent.         -   Roots.—Fibrous, freely branching, fine, and white in color.             Roots develop easily from cuttings. -   Leaf:     -   -   Type.—Simple.         -   Arrangement.—Rosette.         -   Shape.—Broadly ovate.         -   Lobing/division.—5 palmate lobes, the terminal lobe the most             prominent.         -   Venation.—palmate, topside Yellow Green 145A on young             leaves, Greyed Red 183A on old leaves in cold temperatures,             bottom side Yellow Green 145B on young leaves, Greyed Red             183A on old leaves in cold temperatures.         -   Margins.—Broadly crenate.         -   Apex.—Mucronulate.         -   Base.—Cordate.         -   Blade size.—Grows to 10 cm long and 10.5 cm wide.         -   Surface texture.—Glandular pubescent on both surfaces.         -   Petiole description.—Grows to 20 cm long and 2 mm wide,             glandular hairs, Yellow Green N144A with base tinted Greyed             183A; older leaves Greyed Red 183A.         -   Leaf color.—Spring, summer, and fall topside, Yellow Green             145A, bottom side Yellow Green 145B; winter Yellow Green             145A sometimes with veins Greyed Red 183A or tinted Greyed             Orange 165A overall, older leaves margins turn Greyed Red             179D. -   Inflorescence:     -   -   Size.—Grows to 2.4 cm wide and 8 cm long.         -   Type.—Raceme.         -   Attitude.—Upright.         -   Number of flowers per raceme.—About 45.         -   Number of raceme.—30.         -   Peduncle.—Grows to 21 cm tall, 2.5 mm wide at base, Yellow             Green N144A with Greyed Red 183A, glandular hairs.         -   Pedicel.—2.5 mm long, with glandular hairs, Yellow Green             N144A.         -   Bloom period.—April in Canby, Oreg. -   Flower bud:     -   -   Size.—2 mm wide and 3 mm long.         -   Description.—Glandular puberulent, ovoid.         -   Color.—White NN155C. -   Flower:     -   -   Type.—Imperfect.         -   Shape.—Campanulate.         -   Size.—4 mm deep and 5 mm wide.         -   Attitude.—Side-facing.         -   Petal description.—5 in number, linear, 3.5 mm long and less             than 1 mm wide, tip acuminate, base attenuate, margin             entire, glabrous on both sides, White NN155D on both sides.         -   Calyx description.—4 mm deep and 5 mm wide, with 5 lobes,             divided ¾ way to the base, campanulate, glandular hairs on             outside, glabrous inside, tip obtuse, margin entire, NN155D             on both sides.         -   Stamen description.—10, filaments 2 mm long White NN155D,             anthers Greyed Orange 164A, pollen none, sterile.         -   Pistil description.—One central two beaked pistil, 4.5 mm             long and 2 mm wide, White NN155D.         -   Fragrance.—None.         -   Lastingness.—Each raceme blooms for about 2 weeks on the             plant. -   Fruit and seed: None. -   Disease and pest tolerance: The new cultivar is typical to the     genus. No known resistances to pests or diseases. No problems have     been found in Canby, Oreg. 

I claim:
 1. A new and distinct ×Heucherella plant as herein illustrated and described. 